| Front | Round Window |
| Back | inferior to oval windowsealed by the secondary tympanic membraneround window opens to the basal turn of the scala tympani of the cochlea |
| Front | Auditory Ossicles |
| Back | i.e. ossicular chainsmallest bones in the bodyPurpose: deliver sound vibrations to fluid of inner ear; protect inner ear from excessively strong vibrations
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| Front | Oval Window |
| Back | occupied by footplate of stapesopens into the vestibule of the inner ear |